Berenice was the daughter of Costobarus and Salome I, the sister of Herod the Great.
She married her cousin Aristobulus[1] in order to reduce discord within her family caused by Herod's favoritism towards his wife Mariamne I.
[2] This did not solve the problems present among the heirs, and eventually Aristobulus was executed by his father in 6 BCE, and Berenice was accused of complicity in his death.
She eventually remarried to a man named, Theudion (brother of Herod I's first wife Doris, and thus uncle of Antipater), in order to strengthen her family's political ties.
[4] There is little known about Berenice once Herod the Great dies, but it can be assumed that her arranged marriage did not survive the death of her uncle.